I've had this tank for years and have moved alot. Finally been stable enough to get my water quality looking good. Of course we see some algae! Anyways, point is this red coral looking stuff just started growing out of the blue. Grew as fast as Algae did! I've done some light searches and have found no luck. I have a 5 inch clump that has detached, it doesn't sting me. You can see the big clump in the third picture. I have never purchased anything close to it before. Also I haven't purchased anything for my tank in years. Think I have atleast 300 pounds of LR that is atleast 5 years old.











